Tag: grapes disease management

Tim Martinson and Wayne Wilcox, Department of Horticulture and Department of Plant Pathology and Plant Microbe Biology, Cornell University

Mature (dark) and immature cleistothecia on a leaf. The number of mature cleistothecia present at the end of one growing season

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Jay W. Pscheidt, Oregon State University

Symptoms 

Mildly symptomatic grapevines have shorter canes than healthy grapevines. Severe symptoms not only include shorter canes, but also include dwarfed and chlorotic leaves.

Diagnostic mycelial fans can be …

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Stephen Vasquez, University of California, and Matthew Fidelibus, University of California

Symptoms

Grapevine measles, also called esca, black measles or Spanish measles, has long plagued grape growers with its cryptic expression of symptoms and, …

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Stephen Jordan, University of Wisconsin-Madison

Symptoms

Grapevines affected by Ringspot Virus Decline …

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Stephen Jordan, University of Wisconsin-Madison

Symptoms

Grape leafroll disease. Photo by Ed Hellman, Texas AgriLife Extension.

Symptoms differ depending on the variety of affected grape and are best observed in late summer and fall. …

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Stephen Jordan, University of Wisconsin-Madison

Rugose wood is a complex disease characterized by modifications of the woody cylinder. Four different disorders make up the rugose wood complex: rupestris stem pitting, corky bark, Kober stem …

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Damon Smith, Oklahoma State University

Symptoms

Symptoms of sour rot. Photo by Eric Stafne, Mississippi State University.

Ripe fruit with sour rot will become soft and watery. Fruit of white cultivars will turn tan …

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Damon Smith, Oklahoma State University

Symptoms

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Damon Smith, Oklahoma State University

Symptoms

Berry rot and collapse as a result of ripe rot. Note the pink color of the fungal growth and spores on the surface of several of the berries. Photo

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Stephen Jordan, University of Wisconsin-Madison

Symptoms

Symptoms of peach rosette mosaic virus appear 3 to 4 years after infection. The plant canopy is umbrella-like with shortened and crooked internodes. Leaves are misshapen with a …